the ox ##yal ##ly ##l cat ##ion so that no elimination occurs . ( see interrupted cy ##cl ##izations below ) along this same vein , allen ##yl vinyl ke ##tones of the type studied extensively by marcus ti ##us of the university of hawaii show dramatic rate acceleration due to the removal of β @ - @ hydrogen ##s , ob ##via ##ting a large amount of ste ##ric strain in the s @ - @ cis conform ##er . = = classical na ##zar ##ov cy ##cl ##izations = = though cy ##cl ##izations following the general template above had been observed prior to na ##zar ##ov ' s involvement , it was his study of the rear ##rang ##ement ##s of ally ##l vinyl ke
the oxyallyl cation so that no elimination occurs. ( see interrupted cyclizations below ) along this same vein, allenyl vinyl ketones of the type studied extensively by marcus tius of the university of hawaii show dramatic rate acceleration due to the removal of β @ - @ hydrogens, obviating a large amount of steric strain in the s @ - @ cis conformer. = = classical nazarov cyclizations = = though cyclizations following the general template above had been observed prior to nazarov's involvement, it was his study of the rearrangements of allyl vinyl ke